Intake vacuum breaker



May 1, 1934. J. SCHEE L INTAKE VACUUM BREAKER Filed March 29, 1952 min:

,mAFSL ATTORNEY Patented May I, 1934 I v l UNITED s'rA'rEs PATENT OFFICE 1,956,657 INTAKE VACUUM BREAKER John Scheel, Dixon, Calif. Application March 29, 1932, Serial No. 601,810

- 6 Claims. (01. 123-119) This invention relates to internal combustion Formed in the manifold portion 3 above the engines used inmotor vehicles, my principalobportion 2 and below the manifold proper is an ject being to provide a device by means of which auxiliary air passage 8 open at its outer end to the negative or vacuum pull on the pistons is the atmosphere. A butterfly valve 9 is disposed relieved when the engine is operating on a closed in this passage and is mounted on a spindle 10 60 throttle but the car is traveling at such a speed, preferably parallel to the spindle 6. v The spinwith the engine in gear, as to' set up a considerdle 10 is preferably arranged nearer one end of able vacuum drag on the pistons during their the valve 9 than the other so that the vacuum intake stroke. pull on said valve from inside the manifold (or 10 I therefore relieve the engine of this vacuum the corresponding air pressure from the outside) 65 pull when it is not wanted and which causes oil will not tend to'be materially counteracted by pumping and other troubles on account of the the portions of the valve above and below the fact that insufficient air is then being drawn spindle. The valve 9 is arranged when closed past the closed throttle to materially relieve the to make a tight fitin the passage and to lie at negative pressure had in the cylinders on the an acute angle to a vertical plane. Its direction 7 intake stroke of the pistons. At the same time of opening movement is opposite to that of the with my device the desired compression in the valve 5. cylinders which aids in the braking efiect is not An arm 11 projects radially from the spindle only retained but increased and the free influx 10 in a substantially horizontal direction when of relatively large quantities of cool air has a the valve 9 is closed, and such direction is oppo- '75 beneficial cooling effect on the cylinder walls. site to that of the opening movement of said A further object of the invention is to produce valve, so that as' the valve is opened this arm a simple and inexpensive device and yet one will be raised. .An arm 12 projects from the which will be exceedingly effective for the purspindle 6 under the arm 11; these arms being pose for which it is designed. connected by a tension spring 13 having an ad- 80 These objects I accomplish by means of such justingmeans 14 at one end. The arms and structure and relative arrangement of parts as spring are arranged so that said spring is .under will fully appear by a perusal of the following a slight tension when both valves are closed and specification and claims. the arm 12 is considerably longer than the arm In the drawing similar characters of reference 11 fora purpose which will be shortly seen.

indicate corresponding parts in the several views: By means of this arrangement it will be obvious Fig. 1 is a fragmentary side elevation of an that when the throttle valve is closed the spring intake manifold and carburetor of a gas engine 13 while holding the valve 9 closed against a low partly in section and showing my vacuum breakpressure offers little resistance to the opening ing attachment as in operation. movement of said .valve by a relatively high pres- 90 Fig. 2 is a similar view showing. the throttle sure such as the vacuum pressure existing in the valve open and the auxiliary air passage valve manifold when the throttle valve is closed and held closed. when the engine is turning over at a considerable Referring now more particularly to the char- "speed, as when the car is running on its own mo- 40 acters of reference on the drawing, 1 denotes a -mentum and the engine is still in gear. 95 carburetor of conventional design having an out- Such pressure therefore automatically opens let passage 2 for the mixture which is'connected the valve 9 allowing a greater quantity of air to to the adjacent and usual vertical portion 3 of enter the manifold and cylinders than can be V the branched intake manifold proper 4. The drawn in the same time past the closed throttle butterfly or throttle valve 5 is disposed in the valve. The vacuum-conditions in the cylinder 100 passage 2 which sometimes is an integral part on the intake stroke of the pistons is therefore of the carburetor and sometimes of the intake relieved, oil pumping is eliminated, compression manifold-a feature which is immaterial to this is improved, the cylinders are cooled, and fuel invention. The valve 5 is fixed on a turnable consumption is lessened. The shortarmll allows spindle 6 as usual to which the operating arm '7 a relatively great opening of the valve 9 to takeis connec ed wh c is adapted to be anipulated place without any great lengthening of the spring from the drivers compartment of the vehicle in being had such as would greatly increase its ten- 1 the conventional manner. This valve is of course sion and prevent the free opening of the valve 9 arranged to be opened in one direction only from by the air pressure. When however the throttle its closed position. valve is opened the movement of the long arm -12 110 accompanying such opening movement of the valve immediately expands and greatly increases the tension of the spring, so that the spring holds .From the foregoing description it will be readjily seen that I have produced such a device as substantially fulfills the objects of the invention as set forth herein. I

While this specification sets forth in detail the present. and preferred constructionof the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention, as defined by the appended claims.

Having thus described my invention what I claim as new and-useful and desire to secure by Letters Patent is:

1. In combination with the intake manifold of an internal combustion engine adapted at its outer end for connection to a carburetor, and a manually controlled throttle valve for said manifold adjacent said end; an auxiliary air intake passage connected to the manifold beyond said valve. and open to the atmosphere, a valve in said passage and connections between the valves to cause the passage valve to be held closed when the throttle valve is open or closed, but allowing the passage valve to be opened to any extent by vacuum pressure within the manifold when the throttle valve is closedand without affecting the latter.

2. In combination with the intake manifold of an internal combustion engine adapted at its outer end for connection to a carburetor, and a manually controlled'throttle valve for said manifold adjacent said end; an auxiliary air intake passage connected to the manifold beyond said valve and open to the atmosphere, and means associated with said valve and passage and arranged to permit air to be drawn into the manifold through said passage only when the engine is operating and the throttle valve is closed.

3. In combination with the intake manifold of an internal combustion engine adapted at its outer end for connection to a carburetor, and a manually controlled throttle valve for said manifold, a means associated with said valve and manifold to permit air to be drawn into the manifold beyond the valve only when the latter is closed and the engine is operating.

4. In combination with the intake manifold of an internal combustion engine adapted at its outer end for connection to a carburetor, and a manually controlled throttle valve for said manifold having an axial and turnable spindle; an auxiliary air intake passage connected to the manifold beyond said valve and open to the atmosphere, a valve in said passage having an axial and tumable spindle, arms projecting radially from the spindles of both valves, and a tension spring connection between the arms; said arms and valves being arranged relative to each other so that the passage valve opens in a direction opposite to the.

sage, and yieldable connection means between said valves arranged so that the air valve is held closed with all positions of the throttle valve, but with a relatively small pressure when the throttle valve is closed.

JOHN SCHEEL. 

